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Registros recuperados: 10
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Characterizing and Comparing the Spawning Habitats of Sardine (Sardinops sagax) and Anchovy (Engraulis encrasicolus) in the Northern Benguela Region OceanDocs
Tjizoo,Mbeurora Beau.
Spawning habitats of sardine and anchovy in eastern boundary current systems are characterized in an attempt to understand the fluctuations observed in their abundance. The northern Benguela, as an eastern boundary current system, is characterized by turbulent conditions that seem to govern the variability observed in the abundance of these species. Sardine and anchovy have developed mechanisms that enable them to maximize productivity. In the northern Benguela, spawning intensity is historically known to be high in periods and vicinities where turbulence is reduced. However, it is believed that selection of conditions for spawning by these species may change withfluctuations in abundance of fish.
Tipo: Theses and Dissertations Palavras-chave: Sardine fisheries; Spawning; Anchovy fisheries; Habitat; Ecosystems; Sea surface temperature; Salinity; Spatial distribution; Climatic changes; Anthropogenic factors; Pelagic environment; Circulation; Coastlines.
Ano: 2008 URL: http://hdl.handle.net/1834/5231
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Distribution and Abundance of Finfish in Godineau Swamp OceanDocs
Ramsundar, H..
The Godineau Swamp is home to several species of plants, wildlife, fish and waterfowl, including our protected Scarlet Ibis. It has been heavily influenced by anthropogenic activities and probably needs careful regulation of its development in order to obtain the maximum benefits from the swamp without destroying it. The Fisheries component of the Godineau Swamp Research Project aims to document the fish species that live in the swamp, their relative distribution and abundance and characterize the fishing practices in the area. The first phase has been completed and the second phase, characterisation of the fishing practices, is carded to begin in mid- November. The whole Godineau Research project is directed at assessing the ecology of the swamp in its...
Tipo: Other Palavras-chave: Anthropogenic factors; Finfish fisheries; Anthropogenic factors; Http://aims.fao.org/aos/agrovoc/c_34996.
Ano: 2002 URL: http://hdl.handle.net/1834/2914
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Essai d'évaluation de la qualité des eaux de ruissellement du bassin versant de la lagune de Bizerte OceanDocs
Hammami, J.; Brahim, M.; Gueddari, M..
:تقع بحيرة بنزرت في الشمال التونسي وتغذيها عدة أودية تنبع من حوض يمتد على مساحة شاسعة. وتمثل التقلبات المناخية والأنشطة الإقتصادية المتزايدة في السنوات الأخيرة أهم العوامل المؤثرة في هذا الحوض وفي السيول التي تنبع منه في اتجاه البحيرة. لقد قمنا في شهر فيفري في سنة 2003 باقتـاء عينات من الماء مـن 15 مصـب لتحليلـها ( درجة الحرارة، درجة الحموضة، نسبة الأكسجين، الكلوروفيل والمواد العضوية والمعدنية الأزوتية والفسفورية) قصد دراسة هذه الظاهرة. وبينت النتائج التي تم الحصول عليها بأن مياه روافد بحيرة بنزرت تتميز عموما بنسبة عالية للأكسجين وبدرجة حموضة عادية إلى مرتفعة نوعا ما. لكن مياه مصب وادي المرازيق وقنيش والذين يقعان بالتوالي في الشمال الغربي والجنوب الشرقي للبحيرة محملا بأكثر نسبة من المواد الأزوتية والفسفورية. تظهر هذه النتيجة واضحة في التحاليل الإحصائية...
Tipo: Journal Contribution Palavras-chave: Runoff; Anthropogenic factors; Chlorophylls; Physical properties; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Anthropogenic factors; Chlorophylls; Physical properties; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005 URL: http://hdl.handle.net/1834/1533
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Essai d’évaluation de la qualite des eaux de ruissellement du bassin versant de la lagune de Bizerte OceanDocs
Hammami, J.; Brahim, M.; Gueddari, M..
La lagune de Bizerte, située en Tunisie nord-orientale, constitue un bassin récepteur d’un réseau hydrographique bien développé. Afin d’apprécier l’impact des facteurs naturels et anthropiques sur les eaux de ruissellement du bassin versant de cette lagune, une campagne de prélèvement d’eau a été effectuée en février 2003 (période de crue) au niveau de la partie aval de quinze cours d’eau, à raison d’un échantillon par cours d’eau. Les échantillons d’eau prélevés ont fait l’objet de mesure in situ des variables physico-chimiques (température, pH et O2 dissous) et d’analyses au laboratoire de la chlorophylle a et des différentes formes organiques et inorganiques dissoutes de l’azote et du phosphore. Les résultats obtenus ont montré que les eaux de...
Tipo: Journal Contribution Palavras-chave: Anthropogenic factors; Chemical properties; Chlorophylls; Nitrogen; Phosphorus; Physical properties; Pollution monitoring; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chlorophylls; Anthropogenic factors; Physical properties; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005 URL: http://hdl.handle.net/1834/3747
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Impact de l'anthropisation du lac sud de Tunis (Tunisie) sur la structure automnale des peuplementsde nematodes libres OceanDocs
Hermi, M.; Aissa, P..
The answer of the free nematode populations to the physico - chemical state of “ lake ” south Tunis has been studied in autumn 96 from 10 sampling sites. Their very weak specific diversity (Hermi, 2001) and the non selective détritivorous proliferation (1B) bound to the strong contents in recorded organic matter (Hermi, 2001) revealed the sensitivity of nematodes to the eutrophication and nutritionnal pollution. According to several interrelationships calculations, the waters saturation in oxygen, their contents in abeyance matter and in nitrogen as well as the sediments granulometry and their contents in certain heavy metals, appeared the most lagoonar determining parameters. Otherwise, the answer of nematofaunistic communities living in South lake was...
Tipo: Journal Contribution Palavras-chave: Species diversity; Trophic structure; Anthropogenic factors; Species diversity; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2002 URL: http://hdl.handle.net/1834/245
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Impact of agro-industrial activities on the water quality of River Nyando, Lake Victoria Basin, Kenya OceanDocs
Raburu, P. O.; Okeyo-Owuor, J.B..
The impact of agro-industrial activities on the water quality within River Nyando, Lake Victoria Basin (Kenya) was studied at different hierarchical levels between August 1997 and June 1999. Triplicate water samples were collected on a monthly basis from various stations ranging from the source to the mouth of the river and analyzed for selected physical and chemical water quality parameters using standard analytical methods. Statistical analysis was performed using MINITAB and STATISTICA computer packages. Agricultural land use was found to be the major factor contributing to changes in water quality. Salinity and pH varied at river basin scale, turbidity, TDS and conductivity at catchment scale, while DO, alkalinity and pH at subcatchment and river reach...
Tipo: Proceedings Paper Palavras-chave: Water quality; Environmental impact; Industrial wastes; Inland waters; Rivers; Anthropogenic factors; River basin management; Statistical analysis; Physicochemical properties; Land use; Limnological data; Environmental monitoring; Resource management; Environment management; Agricultural pollution; Water quality; Environmental impact; Rivers; Statistical analysis; Land use; Environmental monitoring; Industrial wastes; Inland waters; Anthropogenic factors; Physicochemical properties; Resource management; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_7378; Http://aims.fao.org/aos/agrovoc/c_4182; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_11763; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13330; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006 URL: http://hdl.handle.net/1834/3501
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Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo OceanDocs
Ngaira, Josephine K..
Climate patterns of the World became very variable during the last half of the twentieth century. Causes of this variability/change have been identified as: Sun Spot activity, ozone depletion, decline in the solar beam, with the more pronounced especially in Africa being Increased atmospheric carbondioxide, and albedo change due to anthropogenic factors. The most affected weather elements by the above mentioned factors particularly in the tropics are Rainfall and Temperature, and the climatic environments most affected by the named weather elements are the arid and semi-arid lands which are already moisture constrained. The rift valley in Kenya, where most of the lakes are located experience Arid and Semi-Arid climate. The lakes located in this region are...
Tipo: Proceedings Paper Palavras-chave: Climatic changes; Resource management; Lake basins; Anthropogenic factors; Inland waters; Environmental impact; Water policy; Lake dynamics; Arid environments; Rainfall; Water resources.
Ano: 2006 URL: http://hdl.handle.net/1834/1472
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Water quality trends and input loads to Lake Nakuru OceanDocs
Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006 URL: http://hdl.handle.net/1834/5312
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Акватория и берега Севастополя: экосистемные процессы и услуги обществу IBSS Repository
Шадрин, Н. В.; Павлова, Е. В..
В монографии представлены результаты изучения современной экологической ситуации в акватории Севастополя. Рассмотрены также вопросы взаимосвязей функционирования экосистем и социально-экономического развития. Для экологов, экономистов, менеджеров, студентов и жителей Севастополя.
Tipo: Book Palavras-chave: Ecosystems; Scales; Models; Anthropogenic factors; Eutrophication; Ichthyoplankton; Phytoplankton; Zooplankton; Oil pollution; Litter; Mortality; Coastal zone; Biodiversity; Rivers; Zooplankton; Ecosystems; Scales; Models; Eutrophication; Rivers; Biodiversity; Phytoplankton; Anthropogenic factors; Mortality; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6838; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999 URL: http://repository.ibss.org.ua/dspace/handle/99011/381
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Проблемы антропогенного эвтрофирования и развития гипоксии в северо-западной части Черного моря IBSS Repository
Берлинский, Н. А.; Гаркавая, Г. П.; Богатова, Ю. И..
Рассмотрены этапы изучения влияния речного стока на процессы развития антропогенного эвтрофирования и гипоксии в северо-западной части Черного моря. Показано, что на современном этапе речной сток не является единственным источником биогенных веществ в северо-западной части Черного моря. Большую роль в динамике биогенных веществ этого региона играют процессы, протекающие в контактных зонах моря: “река – море”, “море – атмосфера”, “придонный слой – донные отложения” и “берег – море”.
Tipo: Journal Contribution Palavras-chave: Anthropogenic factors; Anthropogenic factors; Http://aims.fao.org/aos/agrovoc/c_34996.
Ano: 2003 URL: http://repository.ibss.org.ua/dspace/handle/99011/479
Registros recuperados: 10
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